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However, the level of GGBS substitution can be higher, thus the reduction of temperature is higher then Fly Ash.
For example, for a 2m thick section, a 30% Fly Ash replacement will yield a temp rise of ~ 10deg C per 100 kg of cement (total), while a corresponding 70% GGBS replacement yields a lower temp rise of ~ 8deg C per 100kg of cement (total). This is expected as there is less OPC (30% of total cement) reacting in the early hours of hydration in the GGBS concrete mix.
Related Topic: Temperature rise in concrete